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Hornblende Syenite

Hornblende Syenite - Tan- to buff-weathering, pinkish-gray or greenish-gray, medium- to coarse-grained, gneissoid syenite and lesser amounts of quartz syenite containing microcline microperthite, oligoclase, quartz, and hornblende. Some phases are monzonite or monzodiorite.
StateNew Jersey
NameHornblende Syenite
Geologic ageMiddle Proterozoic
Original map labelYbs
CommentsByram Intrusive Suite (Middle Proterozoic) (Drake, 1984)
Primary rock typesyenite
Secondary rock typequartz syenite
Other rock typesmonzonite; monzodiorite
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > SyeniteTan- to buff-weathering, pinkish-gray or greenish-gray, medium- to coarse-grained, gneissoid syenite containing microcline microperthite, oligoclase, quartz, and hornblende.
Minor
Igneous > Plutonic > Syenitic > Quartz-syenitelesser amounts of quartz syenite containing microcline microperthite, oligoclase, quartz, and hornblende
Incidental
Igneous > Plutonic > Dioritic > Monzodiorite
Igneous > Plutonic > Syenitic > Monzonite
Map references
Dalton, R. F., Herman, G. C., Monteverde, D. H., Pristas, R. S., Sugarman, P. J., Volkert, R. A., 1999, New Jersey Department Of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1) export file: geology.e00, scale 1:100,000, unit description files: cslegend.pdf and nlegend.pdf, metadata: metast.pdf.
Unit references
Dalton, R. F., Herman, G. C., Monteverde, D. H., Pristas, R. S., Sugarman, P. J., Volkert, R. A., 1999, New Jersey Department Of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1) export file: geology.e00, scale 1:100,000, unit description files: cslegend.pdf and nlegend.pdf, metadata: metast.pdf.
Drake, Avery A. Jr.,Volkert, Richard, A., Monteverde, Donald H., Herman, Gregory C., Houghton,Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock Geologic Map of Northern New Jersey: U.S. Geological Survey Miscellanenous Investigations Map I-2540-A, scale 1 to 100,000, 4 cross sections, 2 sheets, size 56x40; 58x41.
Drake, A.A., Jr., 1984, The Reading Prong of New Jersey and eastern Pennsylvania; an appraisal of the rock relations and chemistry of a major Proterozoic terrane in the Appalachians, in Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper 194, p. 75-109.
Geographic coverageMorris - Passaic - Sussex - Warren

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